Bagus la explanation ni! Basically, detail scan (2D) tu yang serious one, doctor tengok everything detail-detail untuk pastikan baby develop okay, check untuk any abnormalities macam heart defects, cleft palate, semua tu. 3D4D scan tu more for keepsake, cantik orange-coloured picture of baby's face, tapi mainly untuk fun la. Dua-dua ada timing lain, detail scan biasanya around 18-22 weeks, 3D4D dari 24 weeks onwards. A few of my mum friends yang budget-conscious ambik combo package, dapat both scans dalam satu slot, lebih jimat dan get proper medical info plus the cute pictures. Kalau concern about baby's health, detail scan tu the important one definitely!